Most pCO5 controllers use the standard pGD1 (or pGD0) built-in or remote terminal display. Use this button sequence to navigate to the password screen:
Press the key (the curved arrow or center button) to select the menu.
: A common password for basic parameter unlocking across various Carel models. Other Sequences
| | Typical Access Level/Function | Notes/Common Use Case | | :--- | :--- | :--- | | 0000 | Installer Menu (AERMEC OEM devices) | Default password for the installer menu on AERMEC heat pumps and some other OEM equipment. | | 22 | Service/Configuration (Standard CAREL) | The standard default for many standalone or CAREL-unlocked pCO5 controllers. | | 1234 | Service/Configuration (Common OEM) | Very common for OEM applications where the manufacturer has pre-set this code for installers. | | 0 , 11 | Service (Older Firmware) | Known to be used in some earlier firmware versions , as specified in the specific product manual. | | 44 | Alarm Log | The default password to access the alarm log history on a pCO5 and other devices like the MPXPRO. | | 1357 | Configuration Menu (Sistemair AHU) | A known password for the "CONFIGURATION" menu on a Sistemair air handling unit (AHU) using a pCO5. | carel pco5 controller password
If you're locked out of a specific unit, are you seeing a or is the controller branded by a particular manufacturer (e.g., Daikin, Aermec, or Greenheck)? Providing this can help identify a custom OEM password.
If the default codes fail, a previous technician or site supervisor likely changed the password. Use these methods to recover or bypass it: Method 1: Check the OEM Manual
Carel programmable controllers use distinct password levels to protect system stability. While manufacturers often customize these codes, standard Carel applications generally use the following default values: 1234 Service / Technician Level: 2345 or 0000 Manufacturer / Factory Level: 4321 Most pCO5 controllers use the standard pGD1 (or
Allows facility managers to change basic operational parameters.
When you see the prompt PASS or PS on the screen, the controller is asking for the code corresponding to the security level required to change the parameter you have selected.
Drop the brand below – I’ll try to keep a list. Other Sequences | | Typical Access Level/Function |
: Press Enter on the final digit. If correct, the screen will unlock hidden submenus. Troubleshooting: What to Do If You Are Locked Out
(A non-modifiable "backdoor" code set by Carel if standard passwords are lost) 2. Password Entry Procedure To enter a password on the PGD1/pLDPRO user interface: button to open the main menu. arrows to highlight the desired menu branch (e.g., Manufacturer ) and press When the password prompt appears, use the arrows to scroll to the correct digits. to confirm and gain access. 3. Changing or Resetting Passwords
: Designed for service technicians to acknowledge alarms, adjust setpoints, and test manual overrides.
The of the HVAC equipment (e.g., chiller, precision cooler)?